Designed for the URGI rail (Upper Receiver Group Improved), the Geissele M-Lok Rail Panels feature an aggressive texture that greatly increases the ability to grip and handle your carbine and are made from a carefully selected defense grade polymer that is not only proven for its durability under hard use but also its ability to act as a heat shield. M-LOK Rail Panels are available in Black and DDC. Specifications for Geissele M-Lok Rail Panels: Manufacturer: Geissele Country of Origin: USA Package Contents: Geissele M-Lok Rail Panels